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Finding the Fourth Proportional to 68.45, 102.74 and 67.00

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Solution

The fourth proportional to 68.45, 102.74 and 67.00 is: 100.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.45 : 102.74 = 67.00 : x
  2. Step 2: Convert to fraction form
    68.45/102.74 = 67.00/x
  3. Step 3: Cross multiply
    68.45x = 102.74 × 67.00
  4. Step 4: Simplify right side
    68.45x = 6,884.04
  5. Step 5: Solve for x
    x = 6,884.04/68.45
  6. Step 6: Final answer
    x = 100.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.